论文部分内容阅读
采用室内模拟培养的方法,研究了添加硅酸钙对棕壤基础呼吸和碳酸钙含量的影响,为土壤固碳的技术选择提供理论依据。试验设硅酸钙添加量0%、1%、2%、4%和6%5个处理。结果表明,外源硅酸钙在培养前期显著抑制土壤呼吸,其抑制程度随着硅酸钙添加量的增加而增加,平均抑制率为5%(1%处理)～12%(6%处理);整个培养期间,添加硅酸钙处理的土壤碳酸钙含量较对照显著增加,且随着添加量的增加,土壤碳酸钙含量的平均增幅从83%(1%处理)上升到398%(6%处理);土壤呼吸强度和碳酸钙含量之间符合y=Ae-Bx的指数相关关系。上述结果表明,施用硅酸钙通过促进次生碳酸盐的形成从而缓解土壤CO2释放,起到固碳减排的作用。
The effects of adding calcium silicate on the basic respiration and calcium carbonate content of brown earth were studied by means of indoor simulation training, which provided theoretical basis for the technical selection of soil carbon sequestration. The experiment set the amount of calcium silicate added 0%, 1%, 2%, 4% and 6% of 5 treatment. The results showed that exogenous calcium silicate significantly inhibited soil respiration in the early stage of culture, and its inhibition increased with the increase of calcium silicate. The average inhibition rate was 5% (1% treatment) ~ 12% (6% treatment) During the whole cultivation period, the content of calcium carbonate in soil treated with calcium silicate increased significantly from 83% (1% treatment) to 398% (6%) with the increase of the amount of calcium carbonate. Treatment). The correlation between soil respiration rate and calcium carbonate content was in accordance with y = Ae-Bx. The above results show that the application of calcium silicate acts as a carbon sequestration catalyst by promoting the formation of secondary carbonates and thereby alleviating the release of soil CO2.